The rescue operation is in its fourth day after a deadly flash flood hit the Nepal-Tibet border on Wednesday.

The death toll in Nepal has jumped again today to 626, according to the country's disaster management authority, with 2,426 reported missing - a significant jump from yesterday's figure of 1,924.

In Tibet, the official death toll is seven, with 554 reported to be missing, according to Chinese state media.

Getting information from Tibet can be difficult but China has now released some footage, with one rescuer describing a "scene of ruins".

In Nepal, at least 517 foreign nationals are reported missing, with pilgrims and trekkers among those caught up in the disaster. One man in south London who hasn't heard from his parents says: "We're just hoping and really praying that everything's ok."

Our reporter on the ground says rain has complicated rescue efforts, making it difficult to reach the worst-affected areas. There are also fears a lake formed of floodwater could cause secondary landslides.

But amid the devastation, there are stories of hope, including that of a 97-year-old woman rescued from the rubble of a care home. Her great-nephew tells the BBC she looked like "a warrior" when she was pulled alive from the ruins.